Guokairui focused on stabilizing CUDA build workflows for the kvcache-ai/Mooncake repository, addressing a critical build error related to the USE_CUDA flag. By standardizing std::string usage throughout the C++ codebase and introducing CUDA-specific error checks, Guokairui improved code quality and maintainability. The work also included adding a GPU ID flag, laying the foundation for future CUDA integration and reducing the risk of build failures. Leveraging skills in bug fixing, build systems, and CUDA, Guokairui’s contributions enhanced the project’s readiness for GPU-enabled features, demonstrating a methodical approach to technical debt and long-term codebase stability.